Place in Mississaua called Spectrum Abrasives, get the finest screenig of corn cob they have, won't plug the flash holes.....Product is made by " The Andersons" about $27 a 40 lb bag. I add mineral spirits and car wax, 3/4 of a cup for a large dillon tumbler of mineral spirits andabout 1/4 cup of turtle wax, run it alone for about 1/2 an hour and you are off to the races.